Question about 1997 Jeep Grand Cherokee

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Would not start in the morning. ignition coil,ignition cover, spark plugs and wires, crank sensor, cam sensor, PCM, were replaced.Once it start, run all day without failling.

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  • 252 Answers

Sounds like a fueling problem. Swap the fuel filter, located high up on the firewall in engine bay.

Do you pump the gas pedal before you start it in the morning? There may be an air lock in the system, but pumping it will push fuel forwards.

If that doesn't help, get the injectors checked. They can be professionally pulse cleaned, although weigh up the cost of new injectors compared to the cleaning (I'm guessing you're in the US and I have no idea of inj. cleaning costs).

Good luck!

Posted on Jul 15, 2010

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Posted on Jan 02, 2017

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The fuel pump has nothing to do with spark,common sense

Why would you listen to anyone-- except an experienced
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The computer only grounds the ignition system, to
turn off the ignition coils primary windings & collapse the
secondary field windings, to create the spark at the plugs

You need to know what your doing

You need a good blue spark & also know how much
voltage you have

I suggest you don't check anything your not knowledgeable
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The fuel pump only runs 3 seconds if the PCM sees no crank
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You can check injector pulse as well as spark

If you keep cycling the ignition key ,you fill the cylinders
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I think a repair shop is in order

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